package com.atguigu.gulimail.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.gulimail.search.config.gulimailElasticSearchConfig;
import com.atguigu.gulimail.search.constant.EsConstant;
import com.atguigu.gulimail.search.service.MallSearchService;
import com.atguigu.gulimail.search.vo.SearchParam;
import com.atguigu.gulimail.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author fangy
 * @date 2022-09-30 16:13
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {


    @Autowired
    private RestHighLevelClient client;


    @Override
    public SearchResult search(SearchParam param) {

        SearchResult result = null;

        //1，准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);


        try {
            //2，执行检索请求
            SearchResponse response = client.search(searchRequest, gulimailElasticSearchConfig.COMMON_OPTIONS);

            //3，
            result = buildSearchResult(response,param);
        } catch (IOException e) {
            e.printStackTrace();
        }


        return result;
    }




    /**
     * 准备检索请求
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();//构建DSL语句的

        /**
         *
         */
        //1，构建boolQuery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();

                //1.1,构建must  模糊匹配，
                if (!StringUtils.isEmpty(param.getKeyword())){
                    boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
                }

                //1.2,构建filter 过滤分类catalogId
                if (param.getCatelog3Id() != null){
                    boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatelog3Id()));
                }

                //1.3,过滤品牌
                if (param.getBrandId() != null){
                    boolQuery.filter(QueryBuilders.termQuery("brandId",param.getBrandId()));
                }

                //1.4,过滤属性
                if (param.getAttrs() != null && param.getAttrs().size() > 0){

                    param.getAttrs().forEach(item -> {
                        //attrs=1_5寸:8寸&2_16G:8G
                        BoolQueryBuilder boolquery = QueryBuilders.boolQuery();

                        //attrs=1_5寸:8寸
                        String[] s = item.split("_");
                        String attrId = s[0]; // 检索的属性id
                        String[] attrValues = s[1].split(":");//这个属性检索用的值
                        boolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                        boolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));

                        // 每一个属性都要生成一个 nested 查询
                        NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", boolquery, ScoreMode.None);
                        boolQuery.filter(nestedQueryBuilder);
                    });

                    //attrs=1_5寸:8寸&attrs=1_5寸:8寸
//                    for (String attrStr: param.getAttrs()) {
//
//                        BoolQueryBuilder nestboolQuery = QueryBuilders.boolQuery();
//
//                        String[] s = attrStr.split("_");
//                        String attrId = s[0];
//                        String[] value = s[1].split(":");
//
//                        nestboolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
//                        nestboolQuery.must(QueryBuilders.termQuery("attrs.attrValue",value));
//
//                        //每一个都必须得生成一个nested查询 !!!!!!!!!!!!!!!!!!!!!!!
//                        NestedQueryBuilder nestedQueryBuilder = QueryBuilders.nestedQuery("attrs", nestboolQuery , ScoreMode.None);
//
//                        boolQuery.filter(nestedQueryBuilder);
//
//                    }

                }

                //1.5,过滤  价格区间  skuPrice=1_500/_500/500_
                if (!StringUtils.isEmpty(param.getSkuPrice())){

                    RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

                    String[] s = param.getSkuPrice().split("_");
                    if (s.length == 2){
                        //区间
                        rangeQuery.gte(s[0]).lte(s[1]);
                    }else if (s.length ==1){
                        if(param.getSkuPrice().startsWith("_")){
                            rangeQuery.lte(s[0]);
                        }
                        if(param.getSkuPrice().endsWith("_")){
                            rangeQuery.gte(s[0]);
                        }
                    }

                    boolQuery.filter(rangeQuery);

                }

                //1.6,过滤  库存
                if(param.getHasStock() != null){
                    boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
                }


         sourceBuilder.query(boolQuery);

        /**
         * 高亮，
         */
        //2.1  构建排序
        if(!StringUtils.isEmpty(param.getSort())){
            //sort=hotScore_asc/desc
            String[] s = param.getSort().split("_");

            SortOrder order = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;

            sourceBuilder.sort(s[0], order);

        }

        //2.2  构建分页
        sourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3  构建高亮
        if(!StringUtils.isEmpty(param.getKeyword())){

            HighlightBuilder highlightBuilder = new HighlightBuilder();

            highlightBuilder.field("skuTitle");

            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");

            sourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 聚合分析
         */
        //1,品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg").field("brandId").size(50);
        //1.1 品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //2,分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(50);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3,属性聚合
        NestedAggregationBuilder nestedAggregationBuilder = AggregationBuilders.nested("attr_agg", "attrs");

        //3.1 聚合出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //3.2 聚合分析当前attrId对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //3.3 聚合分析当前attrId对应的所有可能的属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));

        nestedAggregationBuilder.subAggregation(attr_id_agg);

        sourceBuilder.aggregation(nestedAggregationBuilder);

        String s = sourceBuilder.toString();
        System.out.println(s);

        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEXT}, sourceBuilder);


        return searchRequest;
    }


    /**
     * 分析响应数据封装成我们需要的格式
     *
     * @param response
     */
    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();

        //获取到
        SearchHits hits = response.getHits();
        //1,返回所有查询到的商品
        if(hits.getHits() !=null && hits.getHits().length>0){
            ArrayList<SkuEsModel> skuEsModels = new ArrayList<SkuEsModel>();
            for (SearchHit s: hits.getHits()) {
                String sourceAsString = s.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);

                if(!StringUtils.isEmpty(param.getKeyword())){

                    HighlightField skuTitle = s.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);

                }

                skuEsModels.add(skuEsModel);
            }

            result.setProducts(skuEsModels);
        }

        //2，当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();

        ParsedNested attrAggregations = response.getAggregations().get("attr_agg");
        ParsedLongTerms aggregations1 = attrAggregations.getAggregations().get("attr_id_agg");

        for (Terms.Bucket bucket : aggregations1.getBuckets()) {

            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();

            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);

            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);


            List<String> attrValue = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item->{
                String keyAsString = ((Terms.Bucket)item).getKeyAsString();

                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attrValue);

            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);

        //3，当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<SearchResult.BrandVo>();
        ParsedLongTerms brandAggregations = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brandAggregations.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();

            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);

            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);

            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);

            brandVos.add(brandVo);
        }


        result.setBrands(brandVos);

        //4，当前所有商品涉及到的所有分类信息
        ParsedLongTerms aggregations = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = aggregations.getBuckets();

        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();

            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.valueOf(keyAsString));

                ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
                String catalog_names = catalog_name_agg.getBuckets().get(0).getKeyAsString();
                catalogVo.setCatalogName(catalog_names);

            catalogVos.add(catalogVo);
        }

        result.setCatalogs(catalogVos);


//        ===========以上信息从聚合信息中获取===================



        //5，分页信息  页码
        result.setPageNum(EsConstant.PRODUCT_PAGESIZE);
        //6，分页信息  总记录数
        Long total = hits.getTotalHits().value;
        result.setTotal(total);
        //7，分页信息  总页码
        int pagetotal = (int) (total%EsConstant.PRODUCT_PAGESIZE == 0?total/EsConstant.PRODUCT_PAGESIZE: (total / EsConstant.PRODUCT_PAGESIZE+1));
        result.setTotalPages(pagetotal);


        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= pagetotal; i++) {
            pageNavs.add(i);
        }

        result.setPageNavs(pageNavs);


        //TODO 可能是es的DSL语法错误导致属性查找不能使用，因此面包屑导航没做

        System.out.println(result);

        return result;
    }
//TODO 价格排序和有无库存

}
